Ray Ozzie has published an essay on why he works in the collaborative software market. Below is an exceprt where he points out the tension between private space and open space sharing:

Of course, blogs are (and the theory behind klogs is, I believe) at the complete opposite end of the spectrum – being “make public by default”. By choosing to work “in the open”, others surely can benefit from work that “should” be published. And let there be no doubt: if you can get people to work in the open, it can be quite valuable to others so long as people broadly understand what should be shared and what shouldn’t.